A combination of hot and cold mirrors can essentially eliminate 99% of the radiation generated by high-power illumination systems. The cold mirror, mounted at a 45° angle of incidence, transmits much of the heat while reflecting the visible light. The hot mirror, mounted perpendicular to the light beam, reflects the remaining heat while transmitting 90% of the visible light.

Mounted in threaded ring - contact our expert on the right for thread sizes

All filters are available in 12.5, 25.0, 50.0 mm Ø and 50.0 mm SQ.

Filter Type

Part Number

Transmission Curve

Hot Mirrors

Hot mirrors are heat-reflecting filters designed to transmit visible wavelengths and reflect near-infrared heat-generating wavelengths. Andover's hot mirrors have hard, first-surface dielectric coatings that meet or exceed the humidity and abrasion specifications listed above. The coatings are deposited onto a low-expansion material such as borosilicate glass to prevent cracking or crazing from high heat applications

775FW82

Ultraviolet Cold Mirrors

Ultraviolet mirrors differ slightly from the standard cold mirror in that they reflect the ultraviolet and transmit the visible and infrared. They are excellent for applications that call for separating the ultraviolet from the visible and near infrared.

375FV86

Cold Mirrors

Cold mirrors are heat-transmitting filters designed to reflect visible wavelengths and transmit near-infrared wavelengths. Andover’s cold mirrors have first-surface coatings that are deposited onto a low-expansion material such as borosilicate glass.

645FK84

850 nm Cold Mirrors

This version of the cold mirror is identical to the standard cold mirror, but with the reflection range extended to 850nm. It has excellent transmission throughout the NIR region.

850FK84

Infrared Suppressing Filters

These filters extend the blocking of standard hot mirrors across the infrared range using a combination of reflection from the dielectric stack and absorption from an infrared-absorbing filter glass. Because of this absorption factor, these filters are suitable only in low-power applications with a maximum filter temperature of 100°C.

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LOT-QuantumDesign

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We are a leading European distributor of high-quality scientific instruments and components. We offer components and systems used in materials science, imaging, spectroscopy, photonics, nanotechnology and life science research. We were founded over 45 years ago and employ more than 140 dedicated staff across Europe.